On this side of the pond people don’t register things as “ancestry” as in “being descendents of x nationality/ethnicity” unless it’s genuinely the previous or one before that generation.

Even the term “second generation immigrant” refers to different things.

I technically have some ancestry from what is now Russia. And I don’t think theres many generations I have to go back to reach some Swedish ancestry. But I’m Finnish, and it would be utterly ridiculous to even talk about being “descended oof Russian/Swedish ancestry”. And that on the other hand, happen constantly in the US.

Although again, I do understand the difference, as the US had many diasporas which tried keeping their ethnic identity. But also, they did develop a little differently.

What I’ve noted is that in the US it’s usually more a chosen identity thing / continues family tradition than an actual genetic thing.

Also, it’s a super white thing, as most of the slaves lost their origins throughout the years, as it was purposefully suppressed as well. And identifying with Africa in general is quite a large set in terms of specific cultural practices.

I’m thinking OP is less talking about actual ancestry than parentage. Which technically is ancestry but…